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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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package org.openjdk.jcstress.tests.atomics.integer;

import org.openjdk.jcstress.annotations.Actor;
import org.openjdk.jcstress.annotations.Arbiter;
import org.openjdk.jcstress.annotations.Description;
import org.openjdk.jcstress.annotations.Expect;
import org.openjdk.jcstress.annotations.JCStressTest;
import org.openjdk.jcstress.annotations.Outcome;
import org.openjdk.jcstress.annotations.State;
import org.openjdk.jcstress.infra.results.IntResult3;

import java.util.concurrent.atomic.AtomicIntegerArray;

@JCStressTest
@Description("Tests the word-tearing guarantees for AtomicIntegerArray.")
@Outcome(id = "[0, 128, 128]", expect = Expect.ACCEPTABLE, desc = "Seeing all updates intact.")
public class AtomicIntegerArrayInterleaveTest {

    /** Array size: 256 bytes inevitably crosses the cache line on most implementations */
    public static final int SIZE = 256;

    @State
    public static class MyState extends AtomicIntegerArray {
        public MyState() {
            super(SIZE);
        }
    }

    @Actor
    public void actor1(MyState s) {
        for (int i = 0; i < SIZE; i += 2) {
            s.set(i, 1);
        }
    }

    @Actor
    public void actor2(MyState s) {
        for (int i = 1; i < SIZE; i += 2) {
            s.set(i, 2);
        }
    }

    @Arbiter
    public void arbiter1(MyState state, IntResult3 r) {
        r.r1 = r.r2 = r.r3 = 0;
        for (int i = 0; i < SIZE; i++) {
            int s = state.get(i);
            switch (s) {
                case 0:
                    r.r1++;
                    break;
                case 1:
                    r.r2++;
                    break;
                case 2:
                    r.r3++;
                    break;
                default:
                    throw new IllegalStateException(String.valueOf(s));
            }
        }
    }

}
